Perhaps link brokers may add more pages to get round 30 page link limits although this will be a question of domain PR vs. page PR - I guess there are good, bad and ugly paid for links (if you're in the paid for links business).

Perhaps your system would take account of other link variables such as linking domains, source diversity, temporal factors, context/relevance, source TLDs?

Also as others have mentioned there would be many innocent casualties along the way.